A/c

Front 1

A capacitor is constructed by separating two metal conductors called——— with an insulating material called a———

Back 1

Plates, Dielectric

Front 2

Two conductive plates separated by an insulating dielectric is the description of a——-

Back 2

Capacitor

Front 3

Increasing surface area of the plate will cause the capacitance of a capacitor to?

Back 3

Increase

Front 4

In some capacitors there is a small amount of current that flows from one plate, through the dielectric material to the other plate. This current is called?

Back 4

Leakage

Front 5

In a capacitor, the amount of dielectric stress is proportional to?

Back 5

The voltage difference between the plates

Front 6

In a capacitor, the voltage difference between the plates controls the?

Back 6

Amount of dielectric stress

Front 7

Energy in a capacitor is stored as a?

Back 7

Electrostatic charge

Front 8

The insulating material between the plates is rated by a value call the?

Back 8

Dielectric constant

Front 9

The insulating material between the plates is rated by a value call the?

Back 9

Dielectric constant

Front 10

The unit for capacitance is?

Back 10

Farad

Front 11

The farad is the unit of?

Back 11

Capacitance

Front 12

Two capacitors, a 20uF and a 30uf, are connected in parallel. The total capacitance is?

Back 12

50uf

Front 13

Three capacitors, a 12uf, a 20uF, and a 30uf are connected in series. The total capacitance is?

Back 13

62uf

Front 14

Two capacitors, a 12uf and a 30uf are connected in series. Total capacitance is?

Back 14

12uf

Front 15

Three capacitors, a 12uf, a 20uF and a 30uf are connected in series. Total capacitance is?

Back 15

6uf

Front 16

Capacitors charge and discharge at a ——- rate

Back 16

Exponential

Front 17

When a capacitor and resistor are connected in series, the time required to charge and discharge the capacitor depends on what is call the?

Back 17

RC time constant

Front 18

When a capacitor and resistor are connected in series is takes—— time constants for the charge to change completely

Back 18

5

Front 19

A 100uf capacitor and a 3.6kohm resistor are connected in series. How long will it take for the capacitor to change its charge completely.

Back 19

1.8s

Front 20

Nonpolarized capacitors can be used with what type of voltage?

Back 20

Both A/C and D/C

Front 21

Polarized capacitors can be used with what type of voltage?

Back 21

D/C only

Front 22

Polarized capacitors are also known as ——— capacitors

Back 22

Electrolytic

Front 23

Variable capacitors normally have a dielectric of?

Back 23

Air

Front 24

The JAN standard is used to mark a capacitor intended for?

Back 24

Military

Front 25

A HIPOT is a test set used to test capacitor?

Back 25

Dielectric

Front 26

Since a capacitor is two conductors separated by an insulator, ——— cannot flow but ——— will appear to flow

Back 26

DC, AC

Front 27

The opposition to current flow presented by a capacitor is called?

Back 27

Capacitive reactance

Front 28

The unit of capacitive reactance is?

Back 28

Ohm

Front 29

The symbol for capacitive reactance is?

Back 29

Xc

Front 30

A 35uf capacitor is connected to a 60hz, 120v supply. What is the Xc of the capacitor?

Back 30

75.79

Front 31

A capacitor is connected to a 240v supply. An ammeter indicates 3A. What is the capacitive reactance of the capacitor?

Back 31

720ohm

Front 32

In a cct containing a capacitor, the impressed voltage is ——— with the applied voltage.

Back 32

180degree out of phase

Front 33

In a capacitor, the current —— the applied voltage.

Back 33

Leads

Front 34

In a capacitor, the current —— the applied voltage by ——

Back 34

Lead by 90degrees

Front 35

The power in a capacitor is reactive power. The unit for reactive power is?

Back 35

VAR

Front 36

The quality of a capacitor is found by Q=

Back 36

R/Xc

Front 37

The voltage rating of a capacitor should never?

Back 37

Be exceeded

Front 38

The capacitive reactance of a capacitor is ——— proportional to the frequency of the applied voltage

Back 38

Inversely

Front 39

A 10ft capacitor has 2652ohms of reactance at 60hz. How much is the reactance at 400hz?

Back 39

397.88ohms

Front 40

What is the reactance of a 15uf capacitor when the applied frequency is 2.5Khz?

Back 40

4.24ohma

Front 41

What is the reactance of a 25uf capacitor when the applied frequency is 400hz?

Back 41

15.98ohms

Front 42

What is the reactance of a 25uf capacitor when the applied frequency is 400hz?

Back 42

15.98ohms

Front 43

Two capacitors a 20uF, and a 30uf, are connected is series to a 60hz source. The total capacitive reactance is?

Back 43

221.04

Front 44

Two capacitors, a 20uF and a 30uf are connected in series to a 400hz source. The total capacitive reactance is?

Back 44

33.16

Front 45

Three capacitors a 12uf, a 20uF and a 30uf are connected in series to a 60hz source. The total Xc is?

Back 45

442.09

Front 46

Three capacitors, a 12uf, a 20uF and a 30uf are connected in series to a 400hz source. Total Xc is?

Back 46

66.32

Front 47

*important* Two capacitors, a 20uF and a 30uf are connected in parallel to a 60hz source. Total capacitive reactance is?

Back 47

53.05ohms

Front 48

Two capacitors, a 20uF, and a 30uf are connected on parallel to a 400hz source. Total capacitive reactance is?

Back 48

7.96

Front 49

Three capacitors, a 12uf, a 20uF and a 30uf are connected in parallel to a 60hz source. Total Xc is?

Back 49

442.09

Front 50

Three capacitors. A 12uf, a 20uF and a 30uf are connected in parallel to a 400hz source. Total Xc is?

Back 50

6.42ohms

Front 51

In a series RC cct, total impedance is the —— sum of the resistances and reactances in a cct

Back 51

Vector

Front 52

Dividing a cct’s total applied voltage by the total impedance results in total?

Back 52

Current

Front 53

In a series RC cct, Et=240v, R=40ohms and Xc=30ohms. What is Er

Back 53

192v

Front 54

In a series RC cct, Et=240v, R=500ohms and Xc=500ohms. What is the tp?

Back 54

57.62w